ML17261A804

Proposed Tech Specs,Revising Sections 3.5-5 & 3.5-6 Re P-10 Permissive

ML17261A804
Person / Time
Site:	Ginna
Issue date:	12/22/1988
From:	ROCHESTER GAS & ELECTRIC CORP.
To:
Shared Package
ML17261A802	List: ML17261A800 ML17261A803 ML17261A804
References
NUDOCS 8901050229
Download: ML17261A804 (7)

Text

ATTACEBKSTARevisetheTechnicalSpecificationpagesasfollows:Remove3.5-53.5-6Insert3,5-53.5-68501050229PDRADOCK05000244PPDC

0)

TABLE3.5-1PROTECTION~.'EMINSTRUMENTATIONrtNO.FUNCTIONALUNIT1.ManualTOTALNOofCHANN1KSNO.ofCHANNELSTOTRIPMINOPERABLECHANNEISPERMISSIBLEBYPASSCONDITIONS5OPERATORACTIONIFCONDITIONSOFCOLUMN1OR3CANNOTBEMETCHANNELOPERABLEABOVEwhenRCCAiswithdrawn4)QlIUl2.NuclearFluxPowerRangelowsettinghighsetting3.NuclearFluxIntermediate24.NuclearFluxSourceRange25.OvertemperatureaT6.OverpowerAT7.LowPressurizerPressure8.HiPressurizerPressure9.Pressurizer-HiWaterLevelForlowsetting,2of4powerrangechannelsgreaterthan8%F.P.2of4powerrangechannelgreaterthan8%F.P.1of2intermediate2Note13Note1Note1whenRCCAiswithdrawnwhenRCCAiswithdrawnwhenRCCAiswithdrawnNote2HotShutdownHotShutdown8'%owerHotShutdown5%Power10.LowFlowinOneLoop(>50%F.P.)LowFlowBothLoops(8.5%-50'%.P.)'/loop3/loop2/loop2/loop(eitherloop)(bothloops)2/loop2/loop(bothloops)(eitherloop)8%Power8%Poweri0 TABLE3.5-1ContinuPROTECTIONSYSTEMINSTRUMENTATIONNO.FUNCTIONALUNIT11.TurbineTrip12.SteamFlowFeedwaterflowmismatchwithLoSteamGeneratorLevelTOTALNOofCHAN&~2SF-FFand2SGlevelperloopNOofCHANNELSTOTRIP1SF-PFcoincidentw/1LoSGlevelinsameloopMIN.OPERABLECHANNELS2SF-FPor2LoSGlevelperloopPERMISSIBLEBYPASSCONDITIONS5OPERATORACTIONIFCONDITIONSOPCOLUMN1OR3CANNOTBEMETCHANNELOPERABLEABOVE'0%PowerHotShutdown13.LoLoSteamGeneratorWaterLevel14.Undervoltage4KVBus15.Underfrequency4KVBus16.Quadrantpowertiltmonitor(upper&lowerex-coreneutrondetectors)3/loop2/bus2/bus2/loop2/loop1/bus2/bus(bothbuses)(oneitherbus)1/bus2/bus(bothbuses)(oneitherbus)NA1HotShutdown8%Power8%PowerLogindividual;.HotShutdownupper&lowerionchambercurrentsonce/hr&afteraloadchangeof10%orafter48stepsofcontrolrodmotion ATTACHMENTBTheP-10permissiveallowsmanualblockingoftheintermediaterangerodstop,theintermediaterangehighfluxtrip,andlowsetpointofthepowerrangehighfluxtripabove10-opower.Thesetripsareusedtomitigatetheconsequencesofarodwithdrawaltransientfromsubcritical.P-10alsosuppliesanautomaticpermissivetoP-7.Theproposed.TechnicalSpecificationchangewouldallowtheabovetripstobebypassed(blocked)andtheautomaticpermissivetoP-7begenerated.at8Opower.ThischangeisnecessarybecauseP-7permissiveisrequiredat8.5:power.SinceoneoftheinputstoP-7comesfromthesamepowerrangebistablethatsuppliesP-10,P-10mustbeactuatedat8tpowertosatisfytherequirementsforP-7.P-7automaticallyunblocksthefollowingreactortrips:2looplowflow,reactorcoolantpumpbusundervoltage,reactorcoolantpumpbusunderfrequency,pressurizerlowpressureandturbinetripwithP-9.Thesetripsareassociatedwiththe130MWwhichistheupperlimitofheatremovalwhileonnatural.circulation.Theonlytransientanalysiswhichusesthistripisaslowrodwithdrawal.(Borondilutionisboundedbytheslowrodwithdrawal.)TheonlyeffectofreducingP-10to8:wouldbethatarodwithdrawalaccident(RWA)startingfrom8%wouldbeterminatedbyhighfluxandovertemperature~Tversustheintermediateandreducedhighpowertrips.AnevaluationperformedontheRWAstartingfrom8%and10%forvariousreactivityinsertionratesshowsapproximatelythesameDNBRwhentheRWAisinitiatedfrom,8%versus10%power.ThemaximumdecreaseinDNBR'wasapproximately0.007.Further,thereissubstantialmarginbetweentheDNBRforaRWAfrom10%andthelimitingRWAfrom100-opower.TheDNBRforaRWAstartingfrom8-owillalsobegreaterthanthei~DNBRforthelimitingRWAstartedfrom100%power.Therefore,reducingP-10to8'-ohasnegligibleeffectontheGinnaSafetyAnalysisandtheminimumDNBRforallRWAsisunchanged.ThespecificTechnicalSpecificationchangesarelistedonTable1.Inadditiontotheabovechanges,thepowerlevelatwhichtheP-7tripfunctionsarerequiredtobeoperablehasbeenchangedfrom5-oto8'%nTable3.5-1.ThereasonforthischangeisthatatGinna,afunctionisnotconsideredtobeoperablewhileitisblocked.SincetheP-7tripfunctionsarenotunblockeduntil8%,theyarenotconsideredoperableuntil8%eventhoughtheyareautomaticallyunblocked.Thechangefrom5%to8-o,thepointatwhichthetripsareconsideredoperable,maintainsthesetpointwithintheanalyzedrangeofupto8.5'-opower.Inaccordancewith10CFR50.91,thesechangestotheTechnicalSpecificationshavebeenevaluatedagainstthreecriteriatodetermineiftheoperationofthefacilityinaccordancewiththeproposedamendmentwould:B-1 1.'involveasignificantincreaseintheprobabilityorconsequencesofanaccidentpreviouslyevaluated;or2.createthepossibilityofanewordifferentkindofaccidentfromanyaccidentpreviouslyevaluated;or3.involveasignificantreductioninamarginofsafety.ReducingtheP-10setpointfrom10%to8-o,orincreasingtheoperabilityrequirementofablockedfunctionfrom5%to8-odoesnotincreasethefrequency(probability)ofapreviouslyevaluatedaccident.Theconsequencesofanaccidentarenotaffectedbytheoperabilityofablockedtripfunction.ReductionintheP-10setpointhasanegligibleeffectontheDNBassociatedwiththeRWA.SincetheDNBcriteriaismet,thereisnoincreaseintheconsequencesoftheaccident.Thesubjectchangesdonotcreatethepossibilityofanewordifferentaccident.Sincetheaccidentacceptancecriteriaaremet,thereisnoreductioninanymarginof,safety.Asoutlinedabove,RochesterGasandElectricsubmitsthattheissuesassociatedwiththisamendmentrequestareoutsidethecriteriaof10CFR50.91,andtherefore,anosignificanthazardsfindingiswarranted.B-2 0TABLE1DETAILEDTECHNICALSPECIFICATIONCHANGESLocationDescritionofChaneReasonforChaneTable3.5-1Item2.Item3.Item7.Item10.Item14.Item15.Changed10-oto8%Changed10-oto8-oChanged5:to8:Changed5-oto8-oChange5-oto8-oChange5%to8%MakeSpecificationconsistentwithequipmentMakeSpecificationconsistentwithequipmentMakeSpecificationconsistentwithinterpretationofoperabilityMakeSpecificationconsistentwithinterpretationofoperabilityMakeSpecificationconsistentwithinterpretationofoperabilityMakeSpecificationconsistentwithinterpretationofoperability